IBM disk drives

Hello, could anyone help this person out with some information or leads? Please reply to her directly. Thanks, David Greelish Publisher Classic Computing Press www.classiccomputing.com I've been given an assignment to research and compare the differences in the IBM 350, 1301 and 3350 disk drives. I've been searching most of the moring and haven't come up with very much at all. I've checked the IBM site and find mostly current hardware. I've search several other sites and find only brief references to the devices. Would you happen to have any leads that would help me find the Platter diameter, rotation speed, capacity in MB and data tranfer rates of these devices. I'm not asking for answeres, only for possible leads to the information. Thank you for your help, Lorri